patch 8.1.0586: :digraph output is not easy to read

Problem: :digraph output is not easy to read. Solution: Add highlighting for :digraphs. (Marcin Szamotulski, closes #3572) Also add section headers for :digraphs!.
vim · Dec 14, 2018 · eae8ae1 · eae8ae1
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diff --git a/runtime/doc/digraph.txt b/runtime/doc/digraph.txt
@@ -24,7 +24,9 @@ An alternative is using the 'keymap' option.
 1. Defining digraphs					*digraphs-define*
 
 						*:dig* *:digraphs*
-:dig[raphs]		show currently defined digraphs.
+:dig[raphs][!]		Show currently defined digraphs.
+			With [!] headers are used to make it a bit easier to
+			find a specific character.
 							*E104* *E39*
 :dig[raphs] {char1}{char2} {number} ...
 			Add digraph {char1}{char2} to the list.  {number} is